User level: Level 1 (26 points)This feels like a really silly question, given how many years I’ve had an iPhone, but the migration guide has never made it clear to me.
If I’m migrating to a new iPhone from an old one, at what point during the process is it good practice to swap the physical SIM card from the old phone to the new one? Before I start or at then end I guess…
I don’t need advice on eSIM’s ;)
Posted on Sep 16, 2026 4:20 AM
User level: Level 10 (454,138 points)Sep 16, 2026 6:00 AM in response to S500MON
When you migrate from your old iPhone to a new iPhone, the SIM card has no role to play in the actual migration process. The transfer of your apps, settings, photos, messages, accounts, and other data is handled through the iPhone-to-iPhone transfer process, iCloud, or another supported transfer method—not through the SIM card.
You can therefore complete the migration and set up the new iPhone without transferring the physical SIM card first. The SIM becomes relevant after the new iPhone has been fully set up, when you need to activate your cellular service and make or receive regular phone calls and SMS messages.
If you use a physical SIM, you can move it to the new iPhone after the setup is complete. If you use an eSIM, you can transfer or activate the eSIM during or after setup, depending on your carrier's support.
In simple terms: data migration and cellular service are two separate processes. The SIM is not what transfers your data from one iPhone to another; it is primarily what connects the finished iPhone to your mobile network.
3 Ways to transfer data from an old iPhone to a New iPhone… - Apple Community
User level: Level 9 (64,078 points)Sep 16, 2026 4:28 AM in response to S500MON
I’ve always done it when both devices are off and install the SIM in new iPhone before you power it on for the first time. You should also have the old device on a fast and stable WiFi network when you turn it first. Enjoy your new iPhone!
Originally posted at discussions.apple.com/thread/256358072